Means for preventing drafts in doorways



June 19,1923. I 1,459,508

U. KAWASAKI MEANS FOR PREVENTING DRAFTS IN DOORWYS Filed March l0, 1920 Patented .inne 19, 1923.

UNITED IATES UTAKICHI KAWASAKI, or SAN FRANCISCO, CALIFORNIA.-

MEANS FOR PREVENTIG' DRAFTS IN DOORWAYS.

Application filed March 1o, i920.seriai No. 364,827.y

To all whom t may concern Be it known that I, UTAKICHI KAWASAKI,

a subject of the Emperor of Japan, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Means for Preventing Drafts in Doorways, of which the following is a specification.

In large department and other stores and in public places the main entrances or doorways are usually left open. Drafts are thus created and prove a source of discomfort to persons inside the doorway or entrance, for example, clerks in stores having stations near the entrances or doorways are subjected to such discomforts. Again, dust will be carried' in with the drafts and collect upon show cases and goods on display adjacent the doorway.

It is therefore the primary object of my invention to provide simple, effective and inexpensive means which will prevent the entrance of wind, rain andv dust through open doorways and the like and exclude drafts, all without obstructing the door or excluding light, whereby the objections and diliiculties such as hereinbefore mentioned are removed.

The invention possesses other advantages and features, some of which, with the foregoing will be set forth lat length in the following description where I shalloutline in full, that form of the invention which I have selected for illustration in the drawings accompanying and forming a part of the present specification. In said drawings I have shown one form of the construction of my invention but it is to be understood that I do not limit myself to such form, since the invention as expressed in the claims may be embodied in a plurality of forms.

Referring to the drawings Figure 1 represents a rear elevation of a doorway with my invention applied thereto, showing the floor and ceiling in section.

Figure 2 is a. diagrammatic plan view of a double entrance arrangement such as pro,- vided for large stores, showing my invention incorporated therewith. v

Figure 3 is a top plan view of a modified form of the invention.

Figure 4 is a top plan view of another modified formv of the invention.

In carrying out my invention I mount a deflector or screen in the rear of the door way or entrance so as not to obstruct theentrance but order to `obstruct'drafts and wind passing through the doorway. rThe deiiector is wider than the doorway, curvedfor arc-hed[transversely and preferably extends above thedoor from the. ioo'r level. The vertical edges of the deflector arecurle'd or curved to provide Channels and by the transverse ycurve of the deflector air currentsv and wind are directed into these channels and pass therein upwardly and downwardly towards the ceiling and floor. Along the' top 'and bottom of the defiector Aare suction ori-v ficesy which reduce any exhaust ratmospheric pressure entering throughthe doorway. An exhaustpipe is communicated with the oriiicesy andleads to the atmosphere there being a suction pump in the system connected in any suitable manner. y

Ipre'fe'rably make the deflector of glass so as to prevent light obstruction. I may forni the doorway with inwardly Convergingsides so as to direct the'rush of air or wind towards the center of the deflector.v

I have shown the invention as used in connection with the entrance or doorway 1 of double display window store comprising .windows 2 and 3 separated by a passageway a... In the center yof the entrance end of the doorway is mounted ashow case 5., The store end of the entrance lis adapted to be closed .by the ordinary doors 6, vliIounted the doorway. To prevent the air currents from passing the side edges of the deflector I provide inwardly opening curved channels 12 formed of some suitable light sheet metal. These channels be secured in any suitable manner to the vertical edges of the defiector and serve to conduct air currents upwardly towards the ceiling, or downwardly towards the floor. In order to carry out the air currents I provide inthe oor 7'along the lower edge of the def-lector and channels 12 a plurality of exhaust openings 13 and in the ceiling provide at corresponding points along the upper edge "of the deflector similarv exhaust openings 14. These openings communicate by pipes VY wit-lrexhaustrpipes 16 and 17 beneath the floor and above the ceiling respectively. These pipes 16"'a'nd 17 lead topa pipe 18 which leads to an exhaust pump 19. The exhaust pump'exhausts intothe atmosphere through a pipe 20 and may be operated vfrom anys'uitable source of power notshcwn., f y e Wifndbrdraft enteringv through the door- 4 way 1"wi"l'l`strike upon the curved deflector 9 'and by being directed into the channels 12 rowing tothe cnrvatu're of the deiector will pass upwardly or downwardly and in either past the deflector.

Vof my invention may be readily vinstalled in stores andother/pla'ces wherein the entrances arekept open, without-the -necessity of any material change lin vthe construction of the building. y

Referring to' the Figure 3 of the drawing wherein I havef'illustrated a m'odiied form v of' the invention, the wall 21 of the building is'p'rovided with `an entrance or doorway 22 provided with a restricted entrance'end 23.`

rThe sides ofthe entrance converge as at 24 to a point 25"nea1" but spaced from the inner end "28 so that 'the sides of the inner end 23 are'cpara'llel. Imount a vdetlector26 rearwar lyof the entrance end 23, said deiiector vbeing suitably spacedfroin the entrance end and Abeing of the same form as that of the preferred form of thev invention. By having the ydoorway thus formed I direct the aircurrents and wind towards the center of the d'eiector'and in this way positively prevent drafts,'winds, rain and dust from entering In Figure 4 of the drawing theother modified lform of the invention comprises the front wall 27 of the building or store, in which* theV passageway or entrance 28 is pro vided with converging side walls 29. In this iorniloif'the invention the detlector 30 is substantially \/shaped in cross section and provided-at its lvertical edges with ,inwardly opening channels 31. Air'entering the doorway 28 is directed towards the cnter'of the deiiector 3() and is carried off in the same manner as in the preferred form ofthe invention through exhaust pipes not shown.

The detlector in this 'form may be made of l glass or other transparent I claim v 1. In combination with '-the Aentrance or doorway of a building or vstore of a draft-'de- Hector mountedrearwardly of and spaced from the Ainner end of the doorway, said deiiector being wider than-the inner end of -I`Jthe doorway. and exhaust' means'for reducing material.

any excess atmospheric pressure entering through vthe doorv'vay, which `exhaust means is operatively associa-ted with said detlector.

2. The combination with the vvstore entrance, ot' a ytransparent wind detlector extending across entrance rearwardly thereoi, said deflector being curved 1n cross section having its concave side opposed to the" doorway, andv exhaust means associated with the de'flector andi reducing Aany excess atmospheric pressure entering through "the,

doorway. f

3. The combination withthe entrance lor doorway of a building, ot' a draft deflector mounted rearwardly.y of and spaced fromthe doorway, said deflector being wider than the doorway andhaving inwardly curled 'vertical edges, exhaust pipes extendingv along Athe upper and lower sides of 'the deliector and having yorifices leading to vthe 'defiector and an exhaust pumpconnected with said pipe,

the exhaust serving to reduce any atmospheric pressure entering through lthe doorway.

- `YUTAKICHIKAWASAKI. 

